CPUBoss Review Our evaluation of 955 vs 255 among desktop CPUs

Performance

Benchmark performance using all cores

PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics

Fire Strike

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more

Value

Are you paying a premium for performance?

Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more

4.3

CPUBoss Score

Combination of all six facets

Winner
AMD Phenom II X4 955 

CPUBoss recommends the AMD Phenom II X4 955  based on its overclocking.

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VS

Differences What are the advantages of each

Front view of AMD Phenom II X4 955

Reasons to consider the
AMD Phenom II X4 955

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 4 vs 2 Twice as many threads
Much better performance per watt 1.28 pt/W vs 0.8 pt/W More than 60% better performance per watt
Higher clock speed 3.2 GHz vs 3.1 GHz Around 5% higher clock speed
Significantly lower typical power consumption 101.56W vs 116.42W Around 15% lower typical power consumption
Significantly better overclocked clock speed (Air) 3.99 GHz vs 3.8 GHz Around 5% better overclocked clock speed (Air)
Much lower annual home energy cost 30.11 $/year vs 42.79 $/year Around 30% lower annual home energy cost
Better overclocked clock speed (Water) 4.14 GHz vs 3.93 GHz More than 5% better overclocked clock speed (Water)
Lower annual commercial energy cost 109.5 $/year vs 113.7 $/year Around 5% lower annual commercial energy cost
Front view of AMD Athlon II X2 255

Reasons to consider the
AMD Athlon II X2 255

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Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Much higher Maximum operating temperature 74 °C vs 62 °C Around 20% higher Maximum operating temperature

Benchmarks Real world tests of Phenom II X4 955 vs Athlon II X2 255

GeekBench 3 (Multi-core) Data courtesy Primate Labs

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Phenom II X4 955
129,850 MB/s
Athlon II X2 255
125,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench (64-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Phenom II X4 955  vs
Athlon II X2 255 
Clock speed 3.2 GHz 3.1 GHz
Cores Quad core Dual core
Socket type
AM3
Is unlocked Yes No

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
3DNow!
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 125W 65W
Annual home energy cost 30.11 $/year 42.79 $/year
Annual commercial energy cost 109.5 $/year 113.7 $/year
Performance per watt 1.28 pt/W 0.8 pt/W
Typical power consumption 101.56W 116.42W

bus

Clock speed 2,000 MHz 2,000 MHz

details

Phenom II X4 955  vs
Athlon II X2 255 
Architecture x86-64 x86-64
Threads 4 2
L2 cache 2 MB 2 MB
L2 cache per core 0.5 MB/core 1 MB/core
L3 cache 6 MB 1 MB
L3 cache per core 1.5 MB/core 0.5 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 1
Voltage range 0.88 - 1.5V 0.85 - 1.4V
Operating temperature Unknown - 62°C Unknown - 74°C

overclocking

Overclocked clock speed 3.99 GHz 3.8 GHz
Overclocked clock speed (Water) 4.14 GHz 3.93 GHz
PassMark (Overclocked) 3,674.7 1,567.5
Overclocked clock speed (Air) 3.99 GHz 3.8 GHz

integrated graphics

GPU None None
Label N/A N/A
Latest DirectX N/A N/A
Number of displays supported N/A N/A
GPU clock speed N/A N/A
Turbo clock speed N/A N/A
3DMark06 N/A N/A
AMD Phenom II X4 955
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AMD Athlon II X2 255
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